From 076a87e9784635b679ab337b74ebc617c4e2dd3d Mon Sep 17 00:00:00 2001
From: Gregor Kleen <gkleen@yggdrasil.li>
Date: Sun, 3 Sep 2017 22:03:35 +0200
Subject: Much fancier trivmix-service

---
 custom/trivmix-service.nix | 94 ++++++++++++++++++++++++++++++++--------------
 1 file changed, 65 insertions(+), 29 deletions(-)

(limited to 'custom/trivmix-service.nix')

diff --git a/custom/trivmix-service.nix b/custom/trivmix-service.nix
index 44044504..e8cb5072 100644
--- a/custom/trivmix-service.nix
+++ b/custom/trivmix-service.nix
@@ -1,40 +1,69 @@
-{ name
-, run ? null
-, connectOut ? null
-, connectIn ? null
-, group ? null
-, initial ? null
-, adjustable ? true
-, trivmix
-, stdenv
-, makeWrapper
-, jack2Full
-, coreutils
-, writeScript
-}:
+{ config, lib, pkgs, ... }:
+
+with lib;
 
 let
-  connect = (! isNull connectOut) || (! isNull connectIn);
-  connectScript = writeScript "connect" ''
-    #!${stdenv.shell}
+  cfg = config.services.trivmix;
 
-    PATH=${jack2Full}/bin:$PATH
+  mixerModule = {
+    connectIn = mkOption {
+      type = with types; either str (listOf str);
+      default = [];
+      description = "Ports to connect mixer input to";
+    };
 
-    ${optionalString (! isNull connectIn) "jack_connect ${connectIn} $1"}
-    ${optionalString (! isNull connectOut) "jack_connect $2 ${connectOut}"}
-  '';
-  inherit (stdenv.lib) optionalString;
-in {
-  out = {
+    connectOut = mkOption {
+      type = with types; either str (listOf str);
+      default = [];
+      description = "Ports to connect mixer output to";
+    };
+
+    onConnect = mkOption {
+      type = types.lines;
+      default = "";
+      description = "Additional shell commands to run after connections are set up";
+    };
+
+    adjustable = mkOption {
+      type = types.bool;
+      default = true;
+      description = "Should the volume on this mixer be adjustable?";
+    };
+
+    group = mkOption {
+      type = types.nullOr types.str;
+      default = null;
+      description = "Volumes of mixers that share a group name are synchronised";
+    };
+
+    initial = mkOption {
+      type = types.str;
+      default = "1";
+      description = "Initial volume";
+    };
+  };
+
+  service = name: mixerCfg: with mixerCfg; let
+    connectIn = if isList mixerCfg.connectIn then mixerCfg.connectIn else singleton mixerCfg.connectIn;
+    connectOut = if isList mixerCfg.connectOut then mixerCfg.connectOut else singleton mixerCfg.connectOut;
+  
+    connectScript = ''
+      #!${pkgs.stdenv.shell}
+
+      ${concatMapStringsSep "\n" (port: "jack_connect ${port} $1") connectIn}
+      ${concatMapStringsSep "\n" (port: "jack_connect $2 ${port}") connectOut}
+      ${onConnect}
+    '';
+
+    connect = (connectOut != []) || (connectIn != []) || (onConnect != []);
+  in {
     wantedBy = [ "sound.target" ];
     requires = [ "jack.service" ];
-    before = [ "mpd.service" ];
     serviceConfig = {
       Type = "simple";
-      ExecStart = ''${trivmix}/bin/trivmix --client ${name} \
+      ExecStart = ''${pkgs.trivmix}/bin/trivmix --client ${name} \
         ${optionalString connect "--run ${connectScript}"} \
-        ${optionalString (! isNull run) "--run ${run}"} \
-        ${optionalString (! isNull initial) "--level ${initial}"} \
+        "--level ${initial}" \
         ${optionalString (adjustable && isNull group) "/dev/shm/mix/${name}/level"} \
         ${optionalString (! isNull group) "/dev/shm/mix/${group}/level"}
       '';
@@ -43,6 +72,13 @@ in {
       Nice = "-10";
       LimitRTPRIO = "95:95";
       LimitMEMLOCK = "infinity";
-    };
   };
+in {
+  options.services.trivmix = mkOption {
+    type = types.attrsOf (types.submodule mixerModule);
+    default = [];
+    description = "Definition of mixers";
+  };
+
+  config.systemd.services = mapAttrs service cfg;
 }
-- 
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